(Above) Milton Trager: Former Boxer, MD, and creator of the Trager approach.
This style of passive joint mobilization is based on the work of Dr. Milton Trager. Trager realized from a young age that physical pain was often a result of unconscious, psychological defense structures holding the body in a state of structural dysfunction. In order to have the body release these defenses, he developed a therapy where the body is gently rocked, cradled, and shook. The body becomes so relaxed, that the holding patterns (and pain) seem to fade away.